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Your swelling in midline most likely related to Thyroid
gland, if this swelling moves with swallowing even more likely to be from Thyroid. Other differential would be Infection, Lymph
This needs to be examined by doctor to find out cause and any related symptoms or signs.
Hyperthyroid or Hypothyroid issues may be required to be examined and investigated properly by FT3, FT4 and TSH and Thyroid Ultrasonography
may be very useful. If required a Fine needle aspiration biopsy
Please do visit your Physician for proper diagnosis and treatment.
Hope this helps
Dr. Akhilesh Dubey M.D.